The 603e is implemented in several semiconductor fabrication processes. Different processes may require different supply voltages and may have other electrical differences but will have the same functionality. As a technical designator to distinguish between 603e implementations in various processes, a prex composed of the processor version register (PVR) value and a process identier (PID) is assigned to the various implementations as shown below: Table 1PowerPC 603e Microprocessors from Motorola Technical